United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 725
et passage, said horn l)eing also formedwith an external modulating chamber eccen-tric to and covering the whole of said con-cave qiiadrantal deflecting siiiface, said de-flecting surface being also formed with an opening into the modulating chamber oneach side of the axial line of the inlet… … -^Zz^y.A,
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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